VideoWindow.m changed to allow a third input: position [x y xSize ySize].
catch first time when audioTimerCallback is entered > check if player is already running, if not return
catch when datatip cursor is used to start at a specific playback position and pause was pressed the buttonvalue is set to zero in myDataTipfunction to prevent the necessity to double click the next time to pause (only changed in myAudioVisualizer_vid.m)
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